Universal relieving attachment for lathes



Mar. 3. 1925.

A. B. LINDSTROM UNIVERSAL RELIEVING ATTACHMENT FOR LATHES s Sheets-Shet1 Filed Feb. 27, 1922 A. B, LINDSTROM UNIVERSAL RELIEVING ATTA 'CHMENTFOR LATHES Mar. 3. 1925. 1,528,158

Filed. Feb. 2'7. 1922 Sheets-Sheet 5 a f 1 1 .8. 1 as 54 1 a. I

Fatented Mar. 3, 1925:.

UNITED STATES PATENT OFFICE.

AUGUST BEB/NHARID LINDSTROM, OF HARTFORD, CONNECTICUT, ASSIGNOR TO PRATT& WHITNEY COMPANY, OF NEW YORK, N. Y., A CORPORATION OF NEW JERSEY.

UNIVERSAL RELIEVING ATTACHMENT FOR LATHES.

Application filed February 27, 1922. Serial No. 539,523.

exterior and interior relieving operations upon various kinds of work,such as milling cutters, hobs, taps, dies, reamers, etc.

It is an object of the invention to provide a universal relievingattachment comprising a swivel support and a tool slide to be mounted onthe cross slide of a lathe, the support being angularly adjustable aboutthe swivel center to any desired position,

and means including a driven element 00- axial of the swivel andreciprocated axially from a cam at the rear of the cross slide andmechanism cooperating therewith for giving relieving movements to thetool slide in any of its several adjustedpositions.

It is another object of the invention to provide a mechanism of theabove type driven from a rotary cam, and means for.

rendering the cam rotation inoperative thereon independently of anymovement of the tool slide.

Among other objects of the invention are improved means for driving therelieving mechanism from the gearing in the lathe headstock, improvedtool slide operating mechanism mounted in the swivelsupport andincluding means for reversing the direction of relieving movements ofthe tool slide, means for varying the length of such relievingmovements, and opposed resiliently acting means adapted to preventbacklash of the operating mechanism whereby greater accuracy andsmoothness of operation is obtained.

With the above and other objects in view, my invention consists in thefeatures of construction and operation'set forth in the followingspecification and illustrated in can be otherwise embodied and that thedrawings are not to be construed as defining or limiting the scopeof'the invention,

the claimsappended tothis specification being relied upon for thatpurpose.

Referring to the figures of the drawings:

Figure 1 is a partial plan view of a lathe equipped with my improvedrelieving mechanism. 4

Fig. 2 is an end'elevation thereof.

F ig. 3 is a rear elevational view of the relieving attachment drivingmechanism adjacent the headstock taken on line 33 of Fig. 1.

Fig. 4 is a plan view thereof with the cover removed.

Fig. 5 is a side view of Fig. 6, partially in section on line 55 of Fig.8.

Fig. 6 is a front elevational view of the mechanism. 8

Fig. 7 is a detail sectional view.

Fig. 8 is a plan view of the tool slide and its operating mechanism,partially in section.

Fig. 9 is a sectional view thereof on line 9-9 of Fig. 8. I

Fig. 10 is a plan View of the swivel support mounted on the cross slide.

Fig. 11 is a cross sectional view thereof on line 1111 of Fig. 10.

Fig. 12 is an end view of thecross slide, swivel support and tool slide,the taper slide and tool carriage being shown in section.

Fig. 13 is a view like Fig. 12 but with the tool slide screw and itsholding plate re-' moved.

Fig. 1 1. is a sectional view of theoperating mechanism taken on line 1414 of Fig. 8. l

Fig. 15 is a fragmentary end view thereof.

Fig.16 is a cross sectional View thereof on'line 16-16 of Fig. 8.

Fig. 17 is a view like Fig. 16 but showing the cam follower in itsinoperative position.

Fig. 18 is a cross sectional view taken on line 1818 of Fig. 8.

Fig. 19 is a detail View taken on line 19--19 of Fig. 8.

vmoved longitudinally or its ways by means of a screw 6. A lathe spindle7 is mounted in the headstock 3 and is driven from a motor 8 in thebase, as specifically disclosed in application Serial No. 513,167. Also,as illustrated in detail in such application, a

carriage and tool slide feeding gear 9 is operated from the spindle 7 bymeans of a gear 10 on thespindle and an idler gear 11 in mesh with gears9 and 10. As illustrated, the relieving mechanism is driven from the-gear 9. The lathe which is fully described in the above citedapplications, aside from the relieving attachn'ient illustrated,coniprises no part ot the present invention and therefore will net befurther described here- On Sheet 3 of the drawings, the carriage isillustrated as provided with the'usual taper slide 12 secured to aformer or taper bar 13 riding in a groove 14 or the former ortaperattachment. It will be understood, however, that if desired the formerattachment may be removed and the taper slide secured against movementin the carriage in the usual manner. A cross slide 15 is mounted on thetaper slide. The cross slide is adjustable by means of a hand wheel 17and a screw 18 journal-ed in the taper slide and threadedly engaging anut 19 depending from the cross slide. An auxiliary slide 16 is alsomounted on the taper slide to the rear of the cross slide and is securedto the cross slice by means of bolts 16.

A swivel support 20 is illustrated as mounted on the cross slide forswivelling movement about a circular block 21 seat ed therein. The crossslide is provided with a T-slot 22 concentric about theblock, bolts inthe support extending into such slot whereby the support may be adjustedabout the block as a center and secured in any adjusted position. A toolslide having a tool post receiving T-slot 25 therein is mounted forsliding movement on the support.

At its swivel center directly over the block 21 the support 20 isprovided with an axially movable element 26 having a hardened steelblock 27 in its lower end.

This block 27 is engaged by one end of a rocker shoe 28 loosely pivotedat 29 in the the element counterbores.

block 21. Means to be hereinafter described engages the other end of theshoe 28 for rocking the same whereby to reciprocate its stated, therocker shoe is pivoted loosely at 29, the block 21 being providedwith'an arcuate seat'SO concentric oi the pivot 29 and against which thearcuate periphery of the shoe bears, the seat 30 thus taking the thrustof the shoe in operation.

A pair oi intern'ieshing gear segments 31 and 32 are mounted in thesupport 20, the gear 32 being in mesh with racl: teeth on the element26. Reciprocation of the element 26 vill rock the gear segments inopposite directions. lVithin the tool slide at opposite sides of thegear segments are mounted a pair of nuts and 33, the nuts respectivelyhaving projecting portions 3% and 34L extending over and provided withrack teeth respectively engaging gear segments and 82. The nuts areprovided with threaded, bores 35 and 35 "therein for receiving the toolslide screw as herein; after described. The nuts are counterbored at 36and 36, shoulders 5}? and 3? being provided res ectively at the ends ofthe Compression sprin s 38 and 38" are mounted in these counteroores andare held therein by means of bolts 39, 39 threaded into studs 4:0, 10seated in the support 20. The spring 38 may be placed under greatercompression for adjusting purposes by'rotating bolt 89 in its stud 10.Check nuts 41, 41 are provided on bolts 39, 39. lit should be noted thatspring 38 is'coii'ipressed between the head or the bolt 39 and theshoulder 37 on the nut 33, thus normally acting to force the nut 33outward ly (to the left, Fig. Spring 36 is compressed between the studit) and the shoulder 3'? on the nut 32%,thus normally act to force themitt-33 inwardly (to the right Fig. 8).

The tool slide securing screw 36 is journaled in a plate 12 and isprovided with an operating hand wheel The plate may be secured to thetool slide by means of screws 14. In Figs. 8 and 12, the screw isillustrated as oneratively connected to the nut 33. To connect the screwwith the nut 33, the securing screws 42: 1 are removed and the plate1-2. reversed end .torend, which operation brings the screw in alignmentwith the bore 35 in the nut 33.

The cam slide 16 has mounted therein a rotary shaft s pporting a cam 16there-on. A nut 45 on the shaft 1-5 permits removal of the cam -16 andthe substitution therefor 01 other cams having the desiredconfiguration. Adjacent and parallel with the shaft 4-5 an oscillatoryshaft .17. An element as keyed to the shaft 1? and is provided with apin 49 projecting therefrom. A cam follower 50, provided with a camengaging shoe 51, is

loosely mounted on a portion of the element 48 about the shaft 47,aspring plunger 52 normally keeping the follower in rotary engagementwith the pin 49. The periphery of the pin is flattened at 53 and byrotatably adjusting the pin the follower may be made to engage eitherthis flat portion, as illustrated in Fig. 17, or the higher roundportion, as illustrated in F 16. In Fig. 16, the cam engaging shoe 51'in the follower is in cam engaging position and in Fig. 17, the same isout of cam engaging position.

Loosely mounted on the shaft 47 is a bushing 54 on the outer end ofwhich is keyed an operating'handle The inner end of the bushing isprovided with a. projecting portion supporting pins 56 and 57 extendinglongitudinally of the shaft and adapted to engage respectively innotches 58 and 59 in a fiange'on the end of pin 49. As illustrated inFig. 18, the cam follower is engaged on the high portion of the pin 49whereby the follower is in cam engaging position. The pin 56 isengaged'in notch 58 thereby holding the pin 49 against rotation. Itshould be noted that the pin 56 has sufficient play in the notch 58 topermit oscillatory movement of the shaft 47 and itsseveral elementswithout moving the handle and the elements secured thereto. When it isde sired to move the cam follower to the inoperative position, thehandle is rotated from the position shown in Fig. 16 to the positionshown in Fig. 17 (clockwise in Fig. 18). Such operation withdraws the pm56 from the notch 58 and moves pin 57 into the notch 59. Continuedrotation of thehandle 55 operates through the pin 57 and notch 59 torotate the pin 49, thereby engaging the flat portion 52 with the camfollower 50. A spring pressed detent 60 is provided for holding thehandle 55 in either of its two positions.

Th oscillatory movement of the shaft 47 is transmitted to the tool sliderocker shoe 28 through the following mechanism. Engaging the lower endof the rocker shoe is a hardened steel block 61 on the end of alongitudinal bar or plate 62 extending along the taper slide betweensuch slide and the cross and cam slides. At its rear end, the bar isengaged by the flanged head 68 of a bushing 64 loosely-mounted in theauxiliary slide 16. Extending through the center of this bushand looselyinto a bore 65 is a bolt 66. Fleoured to this bolt by means of pin 67 isa block 68 provided with a vertically extending slideway 69 therein. Ablock 70 mounted on a crank arm pin 71 is adapted in operation to slidein this slideway. The pin and block are secured to a. block72slidablydove tailed over an arm 73 secured to the end of the shaft- A screw 74provided. with a knurled head 74 is journaled for rotation on the arm 73at 7 5 (Fig. 19)

and threadedly engages the block 72. As the shaft 47 oscillates, themechanism just described serves to reciprocate the bar 62. The length ofsuch reciprocation may be varied byadjusting the throw of the crankmechanism through rotation of the screw 7 4. The amount of such. adjustment is accurately indicated by a pointer 76 on the block 72 movableover a graduated scale on the arm 7 3 (Fig. 19). Check nuts 77, engagingagainst the bushing 64, are provided on the bolt 66 whereby themechanism maybe ac curate-1y adjusted and any wear of the sev eral partscompensated for. The housing 78 for the operating mechanism described ispreferably provided with a cover plate 79 hinged at 80 and having ahandle. and-locking piece 81., the cam 46and the mechanism directlycooperating therewith preferably running in oil in the housing 78.

The cam 46 is illustrated as being operated from thehead stock gearingas follows: A gear bracket or housing 82 is secured to the rear of thehead stock by means of bolts 83. Gearing, including change gears, ismounted in this housing for operat ively connecting the before-mentionedgear 9 to the cam 46 for rotating the latter. A cover 84 for the housingnormally encloses the gearing therein. A shaft- 85 is mounted in. thehousing and carries thereon a change gear bracket arm .86 provided witha T-slot 87 therein. A bolt 88 threaded into this arm extends through anarcuate slot 89 in the'housing whereby the arm may be adjusted about theshaft 85 and secured in itsadjusted position from the exterior. of thehousing. This armis illustrated as'carrying two idler gears 90 and 91secured together on a stud 92 mounted in the T-slotf A gear 93 isillustrated as being mounted on an eccentric stud 94 on the end of shaft85, such gear meshing with gears 9 and 90. A handle 95 is mounted on theouter end of shaft 85 and is'provided with a spring pressed detent'handle 96 whereby the shaft may be rotated to engage the gear 90 withgear 9 or disengage the same therefrom, the detent: being adapt'ed'tohold the same in either of its said two positions. It is particularlydesirable to disengage the'gear 93 from the gear 9 when using the latheon work requiring a fast tool feed and therefore afast rotation of thefeed gear 9. It should also be stated that the use of the intermediategear 93 spaces the change gears on the bracket 82 from the headstock andfeed gear 9, thereby permitting a compounding of change gears 90, 91 and98. Such construction furthermore pro vides an easy method of applyingthe driving mechanism as an attachmentto a lathe not originallyconstructed for receiving the same.

Beneath the arm 86 is a. shaft 97 carrying a gear 98 in mesh with gear91. A second gear 99 on the shaft 97 meshes with a pinion 100 on a stubshaft 101 in the housing. The two portions 102 and 103 of a telescopicshaft in connection with two universal joints 104 and 105 serve tooperatively connect the shaft 101 with the shaft 45 on which the cam 46is mounted. The cam 46 is thereby rotated from the spindle 7 through themechanism just described. It will be understood that the gears 90., 91and 98 may be changed for gears of different sizes whereby to vary therotation of cam 46 relative to the spindle. It should furthermore benoted that the drive from the gear 9 may be entirely disconnected fromthe exterior of the housing 82- by rotating the handle 95 to disconnectthe gear 93 from the gear 9.

Briefly, the operation of the mechanism is as follows: The cam 4.6 isrotated from the spindle 7 at the desired speed through the drivingmechanism last described. is will be noted, this driving mechanism andthe cam are at the rear! of the bed out of the way of the operator. Forexternal relieving the screw 36 is threaded into the nut 33, asillustrated in Fig. 8. If it is desired to do internal relieving, thescrew is removed from the nut 33 and threaded into the nut 33" in themanner heretofore described. The tool. is adjusted to any desiredangular position relative to the work by rotatably adjusting the swivelsupport 20 about the block 21, bolts 23 operatingin the circular T-slot22 permitting of such adjustment to any degree. Linear adjustment of thetool is made by rotating hand wheels 17 and 43. The amount of reliefdesired is obtained by ro tatably adjusting the screw 74, the amount ofsuch adjustment being indicated by the pointer 76 on the graduatedscale; 1th the handle 55 in the position illustrated in Fig. 17, therelieving. mechanism will be inoperative even though the cam. 46 isrotating. This feature of the invention is particularly useful inreturning the carriage alongthebed: to itsinitial position after havingcompleted a tooling operation.

With the mechanism properly adjusted relativev to a. piece of work andwith the spindle 7 and cam 46 in rotation, to start the relievingoperation, the operator moves the handle 55 from the position shown inFig. 17 to the position shown in Fig. 16. Such 'operationrotates the pin49-and moves the cam follower. 50 to engage the shoe 51 thereof withthecam. Rotation of the cam transmits an oscillatory movement to theshaft 47 through the cam follower 50 engagingpin 49 on the element 48keyed. to the shaft. The arm 73 on the other end Ofthe shaft is rockedas the shaft oscillates and thismovement through the block 72, pin 71and block riding vertically in slideway 69 in block 68 reciprocates thebolt 66 and bushing64longitudinally in the housing 78. This movement istransmitted from the bushing 64 to the bar 62 which rocks the rockershoe 28 and moves the element 26 vertically. The element 26, through theconnections before described, moves the nuts 33 and 33 in oppositedirections. t will be noted that such movement compresses both springs38 and 38. These springs therefore operate against the relievingmovement of the nuts and through the intermediate mechanism normallyhold the cam follower shoe 51 of the cam follower 50 in engagement withthe cam. As illustrated, the tool slide 24 is operatively connected tothe nut 33 (by the screw 36). The tool slide will therefore be movedinwardly under the action of the cam 46 and outwardly under the actionof the springs 38 and 38. It should be noted that the idle stroke of thetool slide 24 under the action of the springs is stopped by theshoulders 37, 37 respectively abutting against stud 40 and the head ofbolt Such construction, being directly adjacent the tool slide, assuresinstantaneous return of the slide as the cam follower shoe 51 drops offthe high portions of the cam. The spring plunger 52 normally holds thecam follower shoe 51 disengaged from the cam. The springs 38 and 38always work in opposition to the spring plunger 52. Such constructionautomatically at all times takes up any looseness in the severaloperating parts, thereby preventing any back lash in the operation ofsuch parts. The inter-engagement of the operating mechanism between thecam follower 50 and the nuts 33, 33 can be accurately adjusted by meansof the nuts 77. The stops, comprising shoulder 37 and nut 41respectively abutting against studs 40 and40, in con nection with thespring plunger 52 prevent any hammering of the cam follower shoe 51 onthe low portions of the cam since the stops limit the action of springs38, 38 and the spring plunger 52 normally holds the follower shoedisengaged from the cam. The nuts 77 will of course be adjusted toprevent a close. contact of the follower shoe on the lowermost portionsof the cam. The construction just described assures quick and accurateaction of the tool slide and its cooperating mechanism, eliminatesvibration and looseness of the several operating parts and preventsexcessive wear thereon.

After finishing a piece ofwork, it is necessary to move the toolcarriagealong the bed back to its initial position. The relieving mechanism mustof course be idle during such operation. This may be accomplished,without in any way disturbing the position of the tool slide 24, merelyby moving the handle 55 from the position shown in Fig. 16 to that shownin Fig. 17. In such latter position, the tool slide is in its backwardposition with the shoulder 37 in engagement with the stud 40. It shouldfurthermore be noted that by means of this cam release, the lathe may beused for regular turning without in any way disturbing the cam or itssupporting mechanism.

The mechanism as illustrated in the drawing, may be used in performinglathe operations comprising straight or taper work and with or withoutrelieving. However, it should be understood that the swivel support 20,with its tool slide 2 k and cooperating mechanism, is illustrated asmounted on the cross slide 15 in place of the regular tool slideordinarly used. Furthermore, the cam slide 16 and its cooperatingmechanism may also be entirely removed from the machine when the latheis to be used for plane work requiring no relieving. It will thereforebe seen that the relieving attachment comprises primarily an auxiliarytool support and a cam slide with cooperating mechanism, such elementsto be mounted on and cooperate with the regular lathe mechanism forperforming relieving operations.

hat I claim is:

1. In combination with a lathe comprising a bed, a tool carriagethereon, and a taper slide and cross slide on the carriage, of anauxiliary tool support adapted to be mounted on the cross slide, a toolholder on the support, an auxiliary slide adapted to be mounted on thetaper slide and secured to the cross slide, and mechanism in and 00-operating with the auxiliary support and auxiliary slide for givingrelieving movements to the tool holder.

2. In combination with a lathe compris ing a bed, a tool carriagethereon, and a taper slide and cross slide on the carriage, of anauxiliary tool support adapted to be swivelly mounted on the crossslide, a tool slide mounted on the support, an auxiliary slide adaptedto be mounted on the taper slide and secured to the cross slide, and

i mechanism in and cooperating with the auxiliary support and auxiliaryslide for giving relieving movements to the tool slide in all adjustedpositions of the support.

3. In combination with a lathe comprising a bed, a tool carriagethereon, and a taper slide and crossslide on the carriage,

of an auxiliary tool support adapted to be mounted on the cross slide, atoolholder on the support, a cam slide adapted to be mounted on the taers'lide and secured to the cross slide, an mechanism including a rotarycam in the cam slide and an operativeconnection between the cam and toolsupport for giving relieving movements to the tool holder.

4:. In combination with a lathe comprising a bed, a tool carria ethereon, and a taper slide and cross slice on the carriage,"

of an auxiliary tool support adapted to be swivelly mounted on the crosssllde, a tool slide mounted on the support, a cam slide adapted to bemounted on the taper slide and secured to the cross slide, and mechanismincluding a rotary cam in the cam slide and an operative connectionbetween the cam and tool slide for giving relieving movements to thetool slide in all adjusted positions of the support.

5. In a relieving attachment for lathes, the combination with a bed, atool carriage thereon, a cross slide on the carriage and a headstock onthe bed provided with gearing therein, a tool slide on the cross slideat the front of the machine, a rotary cam at the rear of the machine,means including a tele scopic shaft for operating the cam from theheadstock gearing, and mechanism between the cam'and tool slide,including a bar extending along the crossslide and reciprocated bythecam, for giving relieving movements to the tool slide.

6. In a relieving attachment for lathes, the combination with a bed, atool carriage thereon, a cross slide on the carriage and a headstock .onthe bed provided with gearing therein, a swivel support on the crossslide at the front of the machine, a tool slide slidably mountedthereon, a tool slide actuating element arranged coaxially of the swiveland operatively connected to the tool slide, a rotary vcam'at the rearof the machine, means including a telescopic shaft for op erating thecum from the headstock gearing, and mechanism between the cam andelement, including a bar extending along the cross slide andreciprocated by the cam, for actuating the said element and givingrelieving movements to the tool slide. l

7. In a relieving attachment for lathes, the combination with a bed, atool carriage thereon, a former bar at the rear of the bed, a taperslide on the carriage operatively connected to the bar, a cross slide onthe taper slide, a tool slide on the cross slide, a rotary cam at therear of the machine, and mechanism between the cam and tool slide,including a bar extending along the taper slide and reciprocatecl by thecam, for giving relieving movements to the tool slide.

8. In a relieving attachment for lathes, the combination with a bed, atool carriage thereon, a former bar at the rear of the bed, a taperslide on the carriage operatively connected to the bar, a cross slide onthe taper slide, a swivel support on the cross slide, a tool slideslidably mounted thereon, a tool slide actuating element arrangedcoaxially of the swivel and operatively connected to the tool slide, arotary cam at the rear of the machine, and mechanism between the cam andelement, including a bar extending along the taper slide andreciprocated by the cam, for actuating the said element and givingrelieving'movements to the tool slide.

9. In a relieving attachment for lathes,

the combination with a'b'ed, a tool carriage and a headstock thereon andgearing in the headstock, a tool slide supported for sliding movement onthe carriage, a rotary cam,

means including a telescopic shaft for operating the cam from theheadstock gearing, mechanism between the cam and tool slide, including abar reciprocated by the cam, for giving relieving movements to the toolslide, andadjustable means between the bar and cam for varying thelength of the said relieving movements.

10. In a relieving attachment for lathes, the combination with a bed anda toolcarriage thereon, a cross slide on the carriage, a tool slidesupported'on the cross slide, a rotary cam at the rear of the machine,means for rotating the cam, an oscillatory shaft parallel. with therotary axis of the cam, means for oscillating the shaft from the cam,mechanism including an element extending along the cross slide andreciprocated by a crank on the shaft for giving relieving movements tothe tool slide, and means for varying the effective length of the crank.to vary the length of relieving movements imparted to the tool slide.

11. In a relieving attachment for lathes, the combination with a bed, atool carriage and a headstock thereon and gearing in the headstock, atool support pivotally mounted on the front of the carriage, a toolslide supported for sliding movement on the support, a rotary cam at therear of the carriage, means including a splined shaft for operating thecam from the headstock gearing, a vertically movable element at thepivotal center of the support, and operative connections between thesaid element and the cam and tool slide whereby the cam rotation willreciprocate the element vertically and give relieving movements to thetool slide.

12. In a relieving attachment for lathes, the combination with a bed, atool carriage and a headstock thereon and gearing in the headstock, atool support pivotally mounted on the front of the carriage, a toolslide supported for sliding movement on the support, a rotary cam at therear of the carriage, means including a splined shaft for operating thecam from the headstock gearing, a vertically movable element at thepivotal center of the support, operative connections between the saidelement and the cam and tool slide whereby the cam rotation willreciprocate the element vertically and give relieving movements to thetool slide, the construction permitting the adjustment of the tool slideto any desired angular position about the said element, and means forreversing the direction of relieving movements imparted to the toolslide by the cam.

13 In a relieving attachment for lathes, the combination with a bed, atool carriage and-a headstock"thereon-and gearing in the headstock, atool slide supported for sliding movement on the carriage, a rotary cam,means including a splined shaft for operating the cam from the headstockgearing, mechanism between the cam and tool slide, including a barreciprocated by the cam, for giving relieving movements to the toolslide, and means for rendering the rotation of the cam inoperative onthe bar.

14. In a relieving attachment for lathes,

the combination with a bed, a tool carriage and a headstock thereon andgearing in the headstock, a tool slide supported for sliding movement onthe carriage, a rotary cam, means including a telescopic shaft foroperating the cam from the headstock gearing, mechanism between the camand-tool slide, including a bar reciprocated by the cam, for givingrelieving'movements to the tool slide, adjustable means for varying thelength of the said relieving movements, means comprising a normallystationary handle for rendering the rotation of the cam inoperative onthe tool slide, the said handle having an operative and an inoperativeposition, and means for holding the handle in either of such positions.

15. In a relieving attachment for lathes, the combination with a bed anda tool car riage thereon, a tool slide supported for sliding movement onthe carriage, a rotary cam, means for rotating the cam, mechanismbetween the cam and tool slide, including a cam follower operative onthe cam, for giving relieving movements to the tool slide,- resilientmeans for holding the cam. follower in engagement with the cam, andmeans optionally operative to hold the follower away from the camthereby rendering the cam rotation inoperative on the said mechanism.

16. In a relieving attachment for 'lathes, the combination with a bedand a tool car riage thereon, a tool slide supported for slidingmovement on the carriage, a rotary cam, means for rotating the cam,mechanism between the cam and tool slide, including a cam followeroperative on the cam, for giving relieving movements to the tool slide,resilient means for holding the cam follower in engagen'ient with thecam, and means optionally operative independently of the said resilientmeans for holding" the follower away from the cam thereby rendering thecam rotation inoperative on the said mechanism.

17. In a relieving attachment for lathes, the combination with a bed anda tool carriage thereon, a tool slide supported for sliding movement onthe carriage, a rotary cam, means for rotating the cam, mechanismbetween the cam and tool slide, including a cam follower operative onthe cam, for giving relieving movements to the tool slide. resilientmeans for holding the cam follower in engagement with the cam, and meansfor rendering the cam rotation inoperative on the said mechanism withoutmoving the tool slide.

18. In a relieving attachment for lathes, the combination with a bed anda tool carriage thereon, a tool slide supported for sliding movement onthe carriage, a rotary cam, means for rotating the cam, mechanismbetween the cam and tool slide, including a cam follower operative onthe cam, for giving relieving movements to the tool slide, resilientmeans adjacent the tool slide for normally withdrawing the toolslide andholding the follower in engagement with the cam, and weaker spring meansadjacent the cam follower operative against the action of the resilientmeans whereby to take up backlash in the said mechanism.

19. In a relieving attachment for lathes, the combination with a bed anda tool carriage thereon, a tool slide supported for sliding movement onthe carriage, a rotary cam, means for rotating the cam, mechanismbetween the cam and tool slide, including a cam follower operative onthe cam, for giving relieving movements to the tool slide, resilientmeans adjacent the tool slide for normally withdrawing the tool slideand holding the follower in engagement with the cam, weaker spring meansadjacent the cam follower operative against the action of the resilientmeans whereby to take up backlash in the said mechanism, and adjustablemeans for increasing the action of the said resilient means to take uplooseness in the mechanism due to wear.

20. In a'relieving attachment for lathes, the combination with a bed anda tool carriage thereon, a tool slide supported for sliding movement onthe carriage, a rotary cam, means for rotating the cam, mechanismbetween the cam and tool slide, including a cam follower operative onthe cam, for giving relieving movements to the tool slide, resilientmeans adjacent the tool slide for holding the cam follower in engagementwith the cam, weaker spring means adjacent the cam follower operativeagainst the action of the resilient means and tending to disengage thecam follower from the cam, and means for either holding the follower incam engaging position against the action of the spring means orpermitting the spring means to move and hold the follower out of camengaging po sition.

21. In a relieving attachment for lathes, the combination with a bed anda tool carriage thereon, a tool slide supported for sliding movement onthe carriage, a r0.- tary cam, means for rotating the cam, mech anismbetween the cam and tool slide including a cam follower mounted on anoscillatory shaft for giving relieving movements to the toolslide,resilient means for holding the cam follower in engagement with the cam,means comprising a normally inoperative position, and means for holdingthe handle in either of said positions.

22. In a relieving attachment for' lathes, the combination with a bedand a tool carriage thereon, a tool slide supported for sliding movementon the carriage, 'a rotary cam, means for rotating the cam, anoscillatory shaft, an element keyed to the shaft, a cam follower looseon the shaft and normally in rotative engagement with the element,mechanism between the oscillatory shaft and tool slide for givingrelieving 'movements to the tool slide, and means including a handleloose on the oscillatory shaft for changing the relative angularpositions of the element and follower to either hold the follower inoper-- ative position relative to the cam or in inoperative postionrelative thereto.

23. A relieving mechanism comprising the combination of a swivelsupport, a tool slide mounted for sliding movement there on, an elementarranged coaXially of the swivel, means for reciprocating the elementaxially, and mechanism connecting the tool slide with the element forreciprocating the tool slide relatively in either direction for externalor internal relieving as, the element is reciprocated.

24:. A relieving mechanism comprising the combination of a swivelsupport, a tool slide mounted for sliding movement thereon, an elementarranged coaxially of the swivel, means for reciprocating the elementaxially, mechanism connecting the tool slide with the element forreciprocating the tool slide relatively in either direction for externalor internal relieving as the element is'reciprocated, and adjustablemeans for varying the length of the reciprocations of the tool slide,the said swivel support being angularly adjustable to any position aboutthe swivel axis and the SEIlCl'lll-BCllanism being operative in allpositions of adjustment.

25. A relieving mechanism comprising the combination of a swivelsupport, a tool slide mounted for sliding movement there on, an elementarranged coaxially of the swivel, means for reciprocating'the elementaxially, mechanism connecting the tool slide with the element forreciprocating the tool slide as the element is reciprocated, adjustablemeans for varying. the length of the relieving movements of the toolslide, and means for reversing the direction of such movements relativeto the reciproating movements of the said element.

26. A relieving mechanism con'iprising the combination of a swivelsupport, a tool slide mounted for sliding movement thereon, an actuatingelement arranged coaxially of the swivel, means for actuating the element, and mechanism comprising a gear on the support operativelyconnected with the element and slide for reciprocating the slide as theelement is actuated.

27. A relieving mechanism minprising the combination of a swivelsupport, a tool slide mounted for sliding movement thereon, an actuatingelement arranged coaxially of the swivel, means for actuating theelement, mechanism comprising a pair of gears on the support operativelyconnected to the element in a manner to be rotated in oppositedirections thereby as the element is actuated, and means for operativelyconnecting either gear to the slide whereby to reciprocate the slide ineither direction relative to the movements of the element as the elementis actuated.

28; A relieving mechanism comprising the combination of a swivelsupport, a tool slide mounted for sliding movement thereon, an actuatingelement arranged coaxially of the swivel, means for actuating theelement, mechanism comprising a pair of gears on the support operativelyconnected to the element in a manner to be rotatedin opposite directionsthereby as the element is actuated, a rack meshing with each gear, andmeans comprising a screw for adjustably connecting either rack with theslide whereby to reciprocate the slide in either direction relative tothe movements of the element as the element is actuated.

29. A relieving mechanism comprising the combination of a swivelsupport, a tool slide mounted for sliding movement thereon, a rackarranged coaxially of the swivel, means for reciprocating the rackaxially, and 1nechanism comprising a gear having toothed engagement withthe rack and slide for re ciprocating the slide as the rack isreciprocated.

30. A relieving mechanism comprising the combination of a swivelsupport, a tool slide mounted for sliding movement thereon, a rackarranged coaXially of the swivel, means for reciprocating the rackaxially, mechanism comprising a pair of gears operatively connected tothe rack in a manner to be re tated in opposite directions thereby asthe rack reciprocates, and means for operatively connecting either gearto the slide whereby to reciprocate the slide in either directionrelative to the rack as the rack reciprocates.

31. A relieving mechanism comprising the combination of a cross slide, aswivel support mounted thereon, a tool slide mounted for slidingmovement on the support, an axially reciprocating element in the supportcoaxial of the swivel, mechanism connecting the tool slide'with theelement for reciprocating the tool slide as the element is reclprocated,a bar extending along the cross slide, means for reciprocating the bar,and means comprising a rocker shoe between the bar and element fortransmitting the reciprocating movements of the bar to the element.

A. relieving mechanism comprising the combination of a cross slide, ablock mounted therein and provided with an arcuate seat, a swivelsupport mounted thereon for adjustment about the block, a tool slidemounted for sliding movement on the support, an axially reciprocatingelement in the support coaxial of tie swivel, mechanism connecting thetool slide with the elementfor reciprocating the tool slide as theelement reciprocates, a bar extending along the cross slide, means forreciprocating the bar, and means comprising a rocker shoe provided withan arcuate portion seated for sliding movement and bearing against theysaid arcuate seat in the block, the said shoe operating between the barand element for,

transmitting the reciprocating movements of the bar to the element.

In a relieving mechanism, the combination of a rotary cam, a shaftadjacent thereto, an element keyed to the shaft, a cam follower loose onthe shaft, spring means normally holding the follower in rotativeengagement with the element, and means including a normally stationaryhandle for changing the relative angular positions of the element andfollower to either hold the follower in operative position relative tothe cam or in inoperative position relative thereto.

34. In a relieving mechanism, the combination of a rotary cam, a shaftadjacent thereto, an element keyed to the shaft, a cam follower loose onthe shaft and normally in rotative engagement with the element where bythe shaft may be oscillated upon rotation of the cam, and meansincluding a handle loose on the shaft for changing the relative angularpositions of the element and follower to either hold the follower inoperative position relative to the cam or in inoperative positionrelative thereto.

85. In a relieving mechanism, the combination of a rotary cam, a shaftadjacent thereto, an element keyed to the shaft and provided with aprojection thereon, a cam follower loose on the shaft, a spring normallyholding the follower in engagement with the projection, and meansincluding a handle loose on the shaft for moving the projection wherebythe element and follower are relatively moved-angularly to either holdthe follower in operative position relative to the cam or in inoperativeposition relative thereto.

36. In a relieving mechanism, thecombiprovided with a projectionthereon, the projection being, provided with a high and low portion, acam follower loose on the shaft, a spring normally holding the followerin engagement with the projection, and means including a handle loose onthe shaft for rotating the projection whereby to engage either the saidhigh or low portion with the follower to hold the follower in operativeor inoperative positions respectively relative to the cam.

3?. In a relieving mechanism, the combination of a rotary cam, a shaftadjacent thereto, an element keyed to the shaft and provided with aprojection thereon,.the pro jection being provided with a high and lowportion, a cam follower loose onthe shaft, a spring normally holding thefollower in engagement with the projection, means including a handleloose on the shaft for rotating the projection whereby to engage eitherthe said high or low portion with the follower to hold the follower inoperative or inoperative positions respectively relative to the cam, andmeans for holding the last mentioned means in either of its saidpositions.

38. In a relieving attachment for lathes, the combination with a bed, atool carriage and a headstock thereon and a gear rotatable in theheadstock, a tool slide sup ported for movement on the carriage,mechanism for operating the tool slide comprising gearing and shaftingincluding change gears adjacent the headstock, a gear adapted tooperatively engage certain of the change gears and the first mentionedgear, and means for bodily moving the second mentioned gear into and outof mesh with the first mentioned gear.

39. In a relieving attachment for lathes, the combination with a bed, atool carriage and a headstock thereonand a gear rotatable in theheadstock, atool slide supported for movement on the carriage, mechanismfor operating the tool slide comprising gearing and shafting includingchange gears adjacent the headst0ck, a gear adapted to operativelyengage certain of the said gear ing and the first mentioned gear, andmeans for bodily moving the second mentioned gear laterally into and outof mesh with the first mentioned gear.

40. In a relieving attachment for lathes, the combination with a bed, atool carriage and a headstock thereon and a gear rotatable in theheadstock, a tool slide supported for movement on the carriage,mechanism for operating the tool slide comprising gearing and shaftincluding change gears, a rotary shaft provided with an eccentricportion thereon, agear mounted on the said eccentric portion and adaptedto operatively engage certain of the said gearing and the firstmentioned gear, and means for rotating the shaft for bodily moving thesecond mentioned gear into and out of mesh with the first mentionedgear.

41. In a relieving attachment for lathes, the combination with a bed, atool carriage and a headstock thereon and a gear rotatable in theheadstock, a tool slide supported for movement on the carriage, ahousing adapted to; be secured to the machine adjacent the headstock,gearing including change gears mounted in the housing, an arcuatelyadjustable arm mounted in the housing and carrying certain of the changegears, means engaging the arm and extending through a slot in thehousing to the exterior thereof whereby the arm may be arcuatelyadjusted from the exterior of the housing, means including a telescopicshaft connecting the said gearing with the tool slide, a gear adapted tooperatively engage certain of the said gearing and the first mentionedgear, and means exterior of the housing for bodily moving the-secondmentioned gear into and out of mesh with the first mentioned gear.

In testimony whereof, I hereto affix my signature.

AUGUST BERNHARD LINDSTROM.

